JP2001009210A - Alga growth-preventing trough for settling basin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alga growth-preventing trough for a settling basin easy in the processing at a factory and the execution work at a site. SOLUTION: In the water collection section consisting of the troughs of the settling basin of a sewage treating facility, an aqueduct plate 4 is provided on a concrete-made trough 2 for covering the open part of the trough 2 and shielding light. Aperture parts 40 are provided on the aqueduct plate 4 so that the treating water overflowed beyond overflow plates 3 and flowed in is guided to the trough 2. Since the concrete-made trough is covered with the aqueduct plate to shield the sunlight, the generation of algae can be restrained. Since the aqueduct plate is produced only by covering the open part of the concrete- made trough, the processing at the factory and the execution work at the site are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus for settling and purifying sewage from a sewage treatment plant or the like, and to an algae prevention trough for suppressing the generation of algae in a trough collecting section installed in a sedimentation tank. It is about.

[0002]

2. Description of the Related Art A sewage treatment apparatus for settling and purifying sewage in a sewage treatment plant or the like is provided with a rectangular or circular concrete sedimentation basin occupying a large area. This sedimentation basin is provided with a trough water collecting section composed of a circular or straight concrete trough and an overflow plate in order to guide the supernatant liquid after sedimentation of suspended matter in the sewage as treated water.

[0003] A large amount of algae are generated in a trough catchment part of a sedimentation basin that receives sunlight directly. In order to suppress the generation of algae, the sunlight is blocked or the trough catchment area exposed to the sunlight is covered with a copper material, and a method utilizing the sterilizing action of copper has been put into practical use as a general method. I have. As shown in FIG. 3, a thin copper plate 30 receiving sunlight receives an anchor over the entire bottom surface 22, inner side surface 23, and upper end surface 21 of the concrete trough 2 having a concave cross section, as shown in FIG. Affixed with pins 31 or rivets. The overflow plate 3 is directly fixed to the outer side surface 24 of the concrete trough 2 by an anchor bolt 33 via a rubber packing 32. Therefore, the treated water flowing in the concrete trough 2 flows in contact with the surface of the thin copper plate 30, and the generation of algae is suppressed by the sterilizing action of copper.

[0004]

The shape of a thin copper plate available on the general market is a constant-width strip. If this is to be applied to a concrete trough, the dimensions of each part of the concrete trough must be measured and recorded in advance and processed at a factory. Generally, concrete structures have large dimensional errors, so it is necessary to measure the dimensions of each part of the concrete trough in detail.It is extremely difficult to process a thin copper plate at the factory to match the dimensions of each part of the concrete trough. It takes time and skill.

[0005] In particular, when a thin-walled copper plate is attached to the trough catchment section of an existing sedimentation basin, the concrete trough, which has been constructed for many years, is damaged by progress of corrosion and cleaning work for removing algae. In many cases, it is necessary to measure more detailed dimensions, which requires a lot of time and labor for dimensioning and processing materials, as well as when attaching on site. Had to perform the work of actual matching, and required a skilled sheet metalworker.

Also, by attaching a thin copper plate,
Algae development is greatly suppressed, but some algae development is still unavoidable and requires cleaning. In the cleaning work, an operator rides on a concrete trough and scrapes off algae using a deck brush or the like. At this time, if there is irregularity in the concrete trough, when the worker rides on the thin copper plate that has been pasted, irregularities occur in the thin copper plate along the irregularity of the concrete trough, and the appearance is impaired . Therefore, in order to minimize the unevenness of the concrete trough, it was necessary to perform repair work using mortar and cushioning material.

An object of the present invention is to solve the above-mentioned problem in the trough catchment section of a sedimentation basin, and an object of the present invention is to provide a sedimentation basin trough which is easy to process in a factory and to perform on-site construction.

[0008]

According to the present invention, there is provided a sedimentation basin trough having a concrete trough covering an open part in a trough collecting part of a sedimentation basin of a sewage treatment apparatus. The headrace plate is provided with an opening for guiding the treated water flowing over the overflow plate to the concrete trough.

In the anti-algal trough of the sedimentation basin, the treated water after the sediment suspended matter in the sedimentation basin flows over the overflow plate onto the headrace plate, passes through the opening, and passes through the opening. Water is introduced to the trough. Since the concrete trough is covered with a headrace plate and blocks sunlight, the generation of algae is suppressed. The headrace plate does not need to be attached to the entire bottom surface, inner surface, and upper end surface of the concrete trough having a concave cross section, and may be provided so as to cover the open portion of the concrete trough. Processing and on-site construction are easy.

If the opening is formed by cutting, bending and inclining a part of the headrace plate, sunlight can be prevented from entering the concrete trough from the opening, and the light shielding effect is large. When the overflow plate is attached to the headrace plate, the overflow plate can be easily attached with a connecting tool such as a bolt or a rivet, and the attachment work is easier than the case where the overflow plate is attached directly to the outer surface of a concrete trough.

If the headrace plate is formed of a copper plate, a bactericidal action of copper occurs in addition to the light-shielding effect.

[0012]

FIG. 1 is a perspective view of an anti-algal trough in a sedimentation pond according to an embodiment of the present invention. Algae prevention trough 1
, Which constitutes a water collecting portion of the sedimentation basin, is composed of a concrete trough 2, an overflow plate 3, and a headrace plate 4. The concrete trough 2 has a concave cross section, and a water guide plate 4 having a shallow concave cross section is fixed via an rubber packing 5 on an upper end surface 21 on both left and right sides thereof with anchor bolts 6. The headrace plate 4 is a copper plate that covers the bottom surface 22, the inner side surface 23, and the upper end surface 21 of the concrete trough 2,
Overflow plates 3 are attached to both left and right ends thereof with attachment bolts 7. If the bolt holes are elongated in the vertical direction, the overflow plate 3 can adjust the mounting height. The overflow plate 3
Since it is attached to the headrace plate 4, the attachment work is easier than when it is attached directly to the concrete trough 2.

An opening 4 through which the treated water flowing over the overflow plate 3 is introduced into the concrete trough 2 is provided in the water channel plate 4.
0 is provided. The opening 40 is formed by making a cut 41 in a part of the water channel plate 4 and bending it downward to incline. It can be prevented from entering the concrete trough 2. Opening 4
The area of 0 is determined so that the treated water can be quickly guided into the concrete trough 2 without overflowing from the overflow plate 3.

In the anti-algal trough 1 of the sedimentation basin, the treated water after sedimentation of the suspended matter in the sewage in the sedimentation basin flows over the overflow plate 3 onto the headrace plate 4, and the opening 40 Through the concrete trough 2. The concrete trough 2 is covered with a headrace plate 4 to block sunlight,
In addition, since the water channel plate 4 is a copper plate, a bactericidal action of copper occurs in addition to the light-shielding effect, so that the generation of algae is suppressed.

The headrace plate 4 does not need to be adhered to the entire bottom surface 22, inner side surface 23, and upper end surface 21 of the concrete trough 2, and the upper end surface 21 covers the open portion of the concrete trough 2. It only needs to be fixed on the top with an anchor bolt 6 via a rubber packing 5. Therefore, since the shape and dimensions of the headrace plate 4 can be determined only by measuring the width and the thickness of the upper end of the concrete trough 2, all the materials can be manufactured and processed at the factory, and the actual physical matching on site can be minimized. There is no need to work with skilled sheet metal work.

As described above, since the processing and the on-site construction at the factory are easy, the construction period can be shortened, and the operation stoppage period of the sedimentation site can be shortened. In addition, since the shape of the headrace plate 4 is simplified, a relatively thick copper plate can be used, and there is no problem even if an operator rides on the headrace plate 4 to perform cleaning work or the like. In order to economically reduce the material cost of the copper plate, when it is desired to reduce the wall thickness, it is preferable to increase the strength by bending the cut so that the front and rear edges of each headrace plate 4 are doubled. .

FIG. 2 is a perspective view of an anti-algal trough of a sedimentation pond showing another embodiment of the present invention. Here, in the anti-algal trough 1, the headrace plate 4 is not concave, and the upper surface is horizontal. Other configurations are the same as those in FIG. Since the shape of the headrace plate 4 is simplified, processing is easier.

[0018]

As described above, in the sedimentation pond anti-algal trough of the present invention, the concrete trough is covered with the headrace plate and the sunlight is cut off, so that the generation of algae can be suppressed. . Since the headrace plate may be provided so as to cover the open part of the concrete trough, processing at the factory and construction on site are easy.

If the opening is formed by cutting, bending, and inclining a part of the headrace plate, sunlight can be prevented from entering the concrete trough from the opening, and the light shielding effect is large. When the overflow plate is attached to the headrace plate, the overflow plate can be easily attached with a connecting tool such as a bolt or a rivet, and the attachment work is easier than the case where the overflow plate is attached directly to the outer surface of a concrete trough.

If the water channel plate is formed of a copper plate, it also has a bactericidal action of copper in addition to a light-shielding effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of an anti-algal trough of a sedimentation pond according to an embodiment of the present invention.

FIG. 2 is a perspective view of an anti-algal trough of a sedimentation pond according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration of a water collecting part of a conventional sedimentation basin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anti-algae trough 2 Concrete trough 3 Overflow board 4 Headrace board 5 Rubber packing 6 Anchor bolt 7 Mounting bolt 21 Upper end surface 22 Bottom surface 23 Inner surface 40 Opening 41 Cut

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuo Yoshisue 2-18-16 Omiya, Asahi-ku, Osaka-shi, Osaka (72) Inventor Takao Tanaka 7-2-14 Shokuman, Amagasaki-shi, Hyogo Prefecture

Claims (4)

[Claims] 1. A concrete trough is provided with a water guide plate for shielding light from an open part in a trough collecting section of a sedimentation basin of a sewage treatment apparatus, and treated water flowing over an overflow plate is provided in the water guide plate. An algae-prevention trough in a sedimentation pond, which has an opening for introducing water to a concrete trough. 2. The anti-algal trough of a sedimentation basin according to claim 1, wherein the opening is formed by cutting, bending, and inclining a part of the headrace plate. 3. The algal protection trough of a sedimentation basin according to claim 1, wherein the overflow plate is attached to the headrace plate. 4. The anti-algal trough of a sedimentation basin according to claim 1, wherein the headrace plate is formed of a copper plate.